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Table:
Files of LTST DB records
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Table:
ST segment annotation codes used for LTST DB
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Table:
Records of LTST DB: 80 patients in 86 records. Patients'
data with numbers of annotated ST segment events according to annotation
protocol A are presented
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sNxxxy: N = number of ECG leads (2 or 3),
xxx = patient number, y = record number;
S = sex;
A = age;
Isc. = ischaemic ST episodes in leads 0, 1, 2;
H.R. = heart-rate related ST episodes in leads 0, 1, 2;
ST/I = combined ST change episodes and combined ischaemic ST episodes;
A/C = ST shifts due to axis shifts in leads 0, 1, 2 (upper),
and due to conduction changes in leads 0, 1, 2 (lower);
diagnosis:
2-VCAD = 2-vessel coronary artery disease;
3-VCAD = 3-vessel coronary artery disease;
AAA = abdominal aortic aneurysm;
AAMI = anterior acute myocardial infarction;
A = angina;
AF = atrial fibrillation;
ASTH = asthma;
BPH = benign prostatic hypertrophy;
CAD = coronary artery disease;
CHF = congestive heart failure;
COPD = chronic obstructive pulmonary disease;
CRF = chronic renal failure;
CVA = stroke;
DCM = dilated cardiomyopathy;
EA = effort angina;
HC = hypercholesterolaemia;
HL = hyperlipidaemia;
HTN = hypertension;
IDDM = insulin-dependent diabetes mellitus;
ILMI = inferolateral myocardial infarction;
LBBB = left bundle branch block;
LHTN = labile hypertension;
LIMA-LADCA = left internal mammary artery
graft to left anterior descending coronary artery;
LVDD = left ventricular diastolic dysfunction;
LVF = left ventricular failure;
LVH = left ventricular hypertrophy;
MA = mixed angina;
MHTN = mild hypertension;
MI = myocardial infarction;
MS = mitral stenosis;
MVP = mitral valve prolapse;
NoCAD = no coronary artery disease;
NOHCM = non obstructive hypertrophic cardiomyopathy;
OA = osteoarthritis;
OHCM = obstructive hypertrophic cardiomyopathy;
PAI = peripheral arterial insufficiency;
PCABG = previous coronary artery bypass grafting;
PCVAx4 = previous strokes x4;
PFO = patent foramen ovale;
PFPB = previous femoral-popliteal bypass;
Pgn = pregnant;
PMA = Prinzmetal's angina;
PMI = previous myocardial infarction;
PPT = palpitations;
PRT = prostatitis;
PSMI = previous subendocardial myocardial infarction;
PTURP = previous transurethral resection of the prostate;
RA = resting angina;
SS = spinal stenosis;
SYE = syncopal episodes;
SY = syncope;
SyX = syndrome X;
SZ = seizure disorder;
TIA = transient ischaemic attack;
UA = unstable angina;
WPW = Wolf-Parkinson-White syndrome
Table:
Overall numbers and durations of annotated ST segment episodes in LTST DB
|
Figure:
Flow of data through annotation phases and signal processing
methodology of records of LTST DB
|
Figure:
Definition of significant ST shift and significant ST episode,
schematic representation of tracking of ST reference level and representation of
annotation protocols. (a) Manual tracking of time-varying ST reference level in ST
level function of ECG lead, except for deviations due to transient ST episodes.
Local-reference annotations are placed at intervals in non-ischaemic data. (b)
Straight-line segments connecting local-reference annotations produce ST reference
function. (c) ST deviation function is obtained as change in ST level function from
which ST reference function is subtracted. GR = global reference; R = local reference
|
Figure:
Example of annotation of lead 1 in record s20271 from time
17:26:00 to 17:50:00. Abbreviated SEMIA's `lead', `KLT' and `data' windows
(from top to bottom) are shown. (a) ST level function (resolution: 100 V unit)
and piecewise linearly interpolated ST reference function (above), heart rate (below),
local reference annotations (LR) defining knot points in ST level function, axis
shift annotations (AX) indicating significant ST shifts, and ST episode annotations
(BI, XI, EI) indicating significant ischaemic ST episode according to protocol A.
(b) Time series of first five (from top to bottom) QRS complex KLT coefficients
(resolution: 1 SD unit), and markers 0 and 1 corresponding to both axis
shift annotations. (c) Original ECG signals (resolution: 1 mV unit X 160 ms
unit) corresponding to local reference (LR) prior to ischaemic ST episode
((A); time: 17:35:15.364) and to extrema (XI, M) of ischaemic ST episode ((B);
time: 17:40:58.868), where centre heart-beats are time-averaged heart-beats over
16 s
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